Subgroup: other

Class: QgsNullSymbolRenderer¶

class qgis.core.QgsNullSymbolRenderer¶

Bases: qgis._core.QgsFeatureRenderer

Null symbol renderer. Renderer which draws no symbols for features by default, but allows for labeling and diagrams for the layer. Selected features will also be drawn with a default symbol.

New in version 2.16: Methods

`capabilities`	Returns details about internals of this renderer.
`checkLegendSymbolItem`	item in symbology was checked
`clone`
`convertFromRenderer`	Creates a QgsNullSymbolRenderer from an existing renderer.
`convertSymbolRotation`
`convertSymbolSizeScale`
`copyRendererData`
`create`	Creates a null renderer from XML element.
`defaultRenderer`	return a new renderer - used by default in vector layers
`dump`
`embeddedRenderer`	Returns the current embedded renderer (subrenderer) for this feature renderer.
`filter`	If a renderer does not require all the features this method may be overridden and return an expression used as where clause.
`filterNeedsGeometry`	Returns true if this renderer requires the geometry to apply the filter.
`forceRasterRender`	Returns whether the renderer must render as a raster.
`legendClassificationAttribute`	If supported by the renderer, return classification attribute for the use in legend
`legendKeysForFeature`	Return legend keys matching a specified feature.
`legendSymbolItemChecked`	items of symbology items in legend is checked
`legendSymbolItems`	Returns a list of symbology items for the legend
`legendSymbolItemsCheckable`	items of symbology items in legend should be checkable
`load`	create a renderer from XML element
`loadSld`	Create a new renderer according to the information contained in
`modifyRequestExtent`	Allows for a renderer to modify the extent of a feature request prior to rendering
`orderBy`	Get the order in which features shall be processed by this renderer.
`orderByEnabled`	Returns whether custom ordering will be applied before features are processed by this renderer.
`originalSymbolForFeature`
`originalSymbolsForFeature`	Equivalent of originalSymbolsForFeature() call
`paintEffect`	Returns the current paint effect for the renderer.
`renderFeature`
`renderFeatureWithSymbol`
`renderVertexMarker`
`renderVertexMarkerPolygon`
`renderVertexMarkerPolyline`
`save`
`setEmbeddedRenderer`	Sets an embedded renderer (subrenderer) for this feature renderer.
`setForceRasterRender`	Sets whether the renderer should be rendered to a raster destination.
`setLegendSymbolItem`	Sets the symbol to be used for a legend symbol item.
`setOrderBy`	Define the order in which features shall be processed by this renderer.
`setOrderByEnabled`	Sets whether custom ordering should be applied before features are processed by this renderer.
`setPaintEffect`	Sets the current paint effect for the renderer.
`setUsingSymbolLevels`
`setVertexMarkerAppearance`	set type and size of editing vertex markers for subsequent rendering
`startRender`	Must be called when a new render cycle is started.
`stopRender`
`symbolForFeature`
`symbols`
`symbolsForFeature`	Returns list of symbols used for rendering the feature.
`toSld`	used from subclasses to create SLD Rule elements following SLD v1.1 specs
`type`
`usedAttributes`
`usingSymbolLevels`
`willRenderFeature`
`writeSld`	create the SLD UserStyle element following the SLD v1.1 specs with the given name

Attributes

`Filter`
`MoreSymbolsPerFeature`
`ScaleDependent`
`SymbolLevels`

clone(self) → QgsFeatureRenderer¶

convertFromRenderer(renderer: QgsFeatureRenderer) → QgsNullSymbolRenderer¶

Creates a QgsNullSymbolRenderer from an existing renderer.

Parameters:	renderer – renderer to convert from
Returns:	a new renderer if the conversion was possible, otherwise None.

convertSymbolRotation()¶

convertSymbolSizeScale()¶

copyRendererData()¶

create(element: QDomElement, context: QgsReadWriteContext) → QgsFeatureRenderer¶

Creates a null renderer from XML element.

Parameters:	element – DOM element context – reading context
Returns:	new null symbol renderer

dump(self) → str¶

originalSymbolForFeature(self, feature: QgsFeature, context: QgsRenderContext) → QgsSymbol¶

renderFeature(self, feature: QgsFeature, context: QgsRenderContext, layer: int = -1, selected: bool = False, drawVertexMarker: bool = False) → bool¶

renderFeatureWithSymbol()¶

renderVertexMarker()¶

renderVertexMarkerPolygon()¶

renderVertexMarkerPolyline()¶

save(self, doc: QDomDocument, context: QgsReadWriteContext) → QDomElement¶

stopRender(self, context: QgsRenderContext)¶

symbolForFeature(self, feature: QgsFeature, context: QgsRenderContext) → QgsSymbol¶

symbols(self, context: QgsRenderContext) → object¶

usedAttributes(self, context: QgsRenderContext) → Set[str]¶

willRenderFeature(self, feat: QgsFeature, context: QgsRenderContext) → bool¶